Rear bumper for an automobile



FIG. 1 is a perspective view of a rear bumper for an automobile showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

The claimed design is indicated by the relatively dark portions in the figures; the relatively light portions form no part of the claimed design. 

CLAIM The ornamental design for a rear bumper for an automobile, as shown and described. 